<?php 
 
// Create a random string, leaving out 'o' to avoid confusion with '0' 
$char = strtoupper(substr(str_shuffle('abcdefghjkmnpqrstuvwxyz'), 0, 4)); 
 
// Concatenate the random string onto the random numbers 
// The font 'Anorexia' doesn't have a character for '8', so the numbers will only go up to 7 
// '0' is left out to avoid confusion with 'O' 
$str = rand(1, 7) . rand(1, 7) . $char; 
 
?>
 
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